Pulp stbaining machine



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R.KR0NN SELF CLEANING PULP 'STRAINING MACHINE.

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SELF' CLEANING PULP STRAINING MACHINE.

Patented Apr. 7,1885.

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` SELF CLEANING PULP STRAINING MACHINE. No. 315,420. i Patented App.7,113.85.

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i SELF GILE-AJWIEIG PULP STRAINING MACHINE. No. 315,420. i Y PatentedAp1-.7, 1885.

(No Model.) 5 Sheets-Sheet 5.

l RMON. SELF CLEANING PULP' STRAINING MAGHIN." hNo. 315,420. PatentedApr. 7f, 1885. Y

15e/keulen r PATENT Ormea* RUDOLF KRON, OFUNTERSTRASS, ZURICH,SWITZERLAND.

sELr--c-I l-:UAN|Nc PULP-STRAININGMACHINE.

i SPECIFICATION forming part of Letters Patent o. 315,420, dated April7, 188.5.

Application filed January B, 1885. (No model.)

To all whom' it may concern: Be it known that I, RUDOLF Knorr, a citizenof the Republic of Switzerland, residing purities of the pulp.

My invention also consists in fastening said screens by means ofwedge-shaped partitionwalls, and further consists in the combination,with said flues either `of `suitable spiral conveyers or valves andslides for continuously removing and leading off the impurities with orwithout the help of water.

My invention also consists in the combination, with said screens andwith said flues, of

suitable shaking mechanism or suction def vices, such as, for instance,a movablecr elastic bottom or diaphragm or pump-piston operated byeccentric disks, cams, or wiperwheels.

The devices hitherto in use for sifting paper-pulp with the object ofveither removing the impurities therefrom or of assorting the pulp intocoarse and fine pulp, consisted of shaking iiat screens. All thesescreens heretofore in use have many and se;

rious defects. The flat screens will get obstructed or choked up in ashorttime by the impurities remaining on the surface of the same, andthereby theweight of the paper will vary considerably. On the otherhand, it is not only troublesome to keep said screens clean,`but alsothe cause of numerous spots in the paper. A The cylindrical andprismatical screens, which are mostly rotary screens, are eithercomplicated and expensive or not very easily exchangeable or to bekeptclean, and great loss of pulp is necessarily connected with theirrunning as well as with the exchange `of screens. The object of myimprovements is toobviateall thesedefects and to construct screens whichneed little tending,

lwhich are easily `washed and exchanged, and

which run noiselessly.

In the accompanying drawings, Figure l represents half-longitudinalsections on lines 1 2 and 3 4 of Fig. 2, which is avertical crosssectionof a machine Awith-my improvements for sifting paper-pulp, and with thescreenplates inclined toward each other. a cross-section through amachine with only one screen-plate. Fig. 4 is a part cross-section withtwo screen-plates inclined both to# Fig. 3 is.

ward the outside; Fig. 5, apart cross-section` with two curvedscreen-plates, and Fig. 6`

cross-section through a machine withtwoj curved screenfplates and with.two different means for Ashaking the pulp. Figs. 7, 8, 9,

10, and 11 arepart sections showing modif cations of the flue leadingoff the impurities. Similar letters of reference in different iiguresindicate similar parts.

- In Figs. l and 2, K represents the box of y wood or cast-ironcontaining the two sifting screen-plates l?, which are provided withslots" or holes suiting the'fi'neness of pulp .which is desired. Thescreens P are declining towardl-` the center of the box and are placedwith their lower edge on top of the cast-iron iiue' A; which is castintegral with box K, and which 1 leads off the impurities of the` pulp,.with` the upper edge of said screens resting within grooves p", cast tothe walls of the box K.

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- In order. to secure thescreens rigidlyfastf within said box, acast-iron partition-plateT, e with a wedge-shaped bottom end is pressingon the lower ends of the screens, and retaining` grooves p2.

85 lthe upper ends of the same within the said f The partition-plate T,in'order tofacilitate the removalof `the impurities,I is provided`9,0.,V

with a number of openings, t, at its bottom end, whereby the twoportions of the boxare'4r communicating.

The cast-iron pipe` or flue A is provided with `a slot, ct', beneath the`lower ends of screens P, and with an outlet, a, at one end for theimpurities or coarser pulp retained by the screens. '1 i' l A fan-valve,H, with a suitable number `of blades, is journaledto boxsKooncentrically"j n` With pipe A, and iittingflike `a valve,uvith only avery little play, to the inside space of the same. This fan H is drivenby means of a journaled shaft, D, which is the driving-shaft of themachine. A pulley, d', receiving motion from some source of power, iskeyed to said shaft like a pulley, d2, which is belted to the pulley h2of the shaft offan-valve H. This shaft of fan H is provided at itsjournals with a suitable stuffing-box, h', in order to prevent any waterfrom leaking through the said journals. Driving-shaft D isjournaled tothe frame marked with k underneath box K.

Underneath the screens P a bottom or floor plate, B, of cast -iron orwood is secured g water-tightly fast to the walls of box K on one sideand to a iiange cast to the outside of pipe A on the other side. Thiselastic connection is made by means of the rubber or leather bands b',and a water-tight receptacle is thus formed underneath the screens P forthe sifted pulp. This pulp will flow out through the outlet O, (see Fig.1,) and may be conveyed io the Fourdrinier or other machines by means ofthe trough Z. As it is always necessary to keep the pulp in motion, ashaking device is provided for the elastically-attached bottom plate, B.

A rocker-shaft, bo, with the angular levers b3 keyed thereon, isjournaled underneath box K and plate B, and said angular levers arehinged with one arm to the eye-pieces b2, which are rigidly fast tothebottom plate, B, and with the other arm said levers arelinked to aneccentric disk, E, by means of links b4, said eccentric disks E beingmounted on shaft D. The-mechanism just described will produce a verticaloscillating movement for plate B, and thereby no settling of the pulpwill be possible, and the same will remain uniformly suspended withinthe water.

The pulp to be sifted is conducted to the machine by means of the duesY, and by means of suitable overtlows,g/,iiows on the screens P.According to the size of holes or slots of the same a portion of thepulp with the water will go through the screens and drop into thereceptacle with shaking-oor,and will iiow therefrom through outlet Ointo the trough Z. The parts-such as impurities and the coarse pulpwhichremain on the surface of the screens P will be washed off or flow downover the inclined surfaces of the screens P into the pipe Athrough theslot a', and are still mixed with sufficient water as to ow off throughthe outlet u?. The revolving fan-valve H will prevent any settling ofthe pulp in pipe A, and will help to convey the same toward the outleta2.

If it becomes necessary to exchange the screens P, the partition-plate Tis taken off, and the screens can be easily removed.

As shown in Fig. 3, the machine may also be built with only one inclinedfiat screenplate P, and then I prefer to fasten said plate by means ofthe wedges p', made of wood or iron. The pipe A in this case is locatedon one side of the box, and is provided also with slot a', fan ai, andan outlet, which, however, is not to be seen in Fig. 3. In most -casesit may become necessary to inject water for rinsing purposes into pipe Athrough an inlet, a3, (shown in Fig. 3,) at the bottom of pipe A. Thefan H is shown in Fig. 3 driven from the driving-shaft D by means of atrain of gearwheels, the wheel g keyed onto the drivingshaft D, wheel g2engaging wheel g and cast together with gear-wheel g3, and bothjournaled on pin which is fast to frame 7c, and wheel ga engaging wheelg4 at the end of shaft of fan-valve H. Box K is also provided with anelasticallyattached bottom plate, B, and with an outlet, O. Thevibratory motion of said plate B is obtained, as shown in Fig. 3, bymeans ofa dii'- ferent lever combination. The eccentric disk Eoscillates by means of an intermediate link, b4, the end of lever-arm b,which is fulcrumed with its other end to the frame k of the Inachine,and which oscillates the plate B by means of the link b5 and eye-pieceb2.

' In Fig. 4, the iiat screen-plates P are shown declining from thecenter toward both sides, and two iiues or pipes, A, for the coarse pulpor for the impurities are shown cast integral with box K of squarecross-section, but also provided with slots u in their top walls. Theiiue Y is shown above the partition-wall T, which in this case wedgesdown the upper ends of the screens P, while the lower edges of the saineare inserted in grooves cast in tegral with the side walls of box K. Theoverflows 3/ of the flue Y are shown in the bottom of the same on bothsides of the partitionwall T.

Fig. 1l shows a very convenient modification of the arrangement of theoutlet O and the overflow into iiue Z, as shown in Figs. 1 and 3, saidoutlet being led, like a siphon, around and underneath the pipe A.

In Figs. 5 and 6 different means from those shown in Figs. 1, 2, 3, 4,and l1 for agitating the sifted pulp are shown. The bottom of box K iscast rigid and integral with the side walls, and instead of having avertically-oscillating bottom plate, B, circular disks or square platesC, as shown in Figs. 5 and the right-hand side of Fig. 6, are rigidlyfast to the top of sleeved rods and are made to move up and downunderneath the screensP within the receptacle for the sifted pulp. Bythis contrivance an alternate section will be created on the unsiftedpulp, so as to facilitate and accelerate the sifting process, and at thesame time the sifted pulp is strongly agitated, so as to be kept in auniform state of iiuidness. The same result as by the disks C isobtained by the device shown on the left-hand side in Fig. 6. Acylinder, J, like that of a pump, with stuffing-box j is secured rigidlyfast underneath and to the bottom of box K, and a piston, I, is fittedtherein and moved up and down, so as to produce alternately a suctionwithin the receptacle. The piston I of the pump cylinder as well as thedisk C with ICC 4o journaled shaft S.

sleeved rod receive their movement from a driving-rod, D, which is'journaled to the frame K, and provided with similar eccentric disks E,as shown in Figs. 1 and 2. lThe piston I and the end of rod-carryingdisk D are linked each by means of an intermediate link, i', to alever-arm, t, which is linked to the eccentric disk E, as shown in Fig.6. In the same figure the machine is shown with two curvedscreen-plates, P, and with a helical conveyer, H, within the pipe A forcarrying off the coarse pulp and the coarse impurities. This helicalconveyer H is fully equivalent to the four-bladed fan shown in Figs. 1,2, 3, and 11, and these organs, besides preventing any settling of thepulp in said pipe A, have for their object to shut oft' alternately thepipeA from the pulp on top of the screens in order to prevent too greata loss of. fine pulp by checking from time to time the flowing down ofthe pulp over the screens. Devices for the same purpose,which may all beconsidered as equivalents, are shown in Figs. 7, 8, 9, and 10.

In Fig. 7 the helical conveyer H is shown substituted Aby a shaft, H,with cam-disks, which alternately shut and open the slot a by means of aiiat bar, h2, which is guided vertically by means of the studs h,securedthereto, said studs sleeved in suitable rings cast integral with the boxK. In order to prevent the settling of the pulp in pipe A, in this ease,like in Figs. 8, 9, and 10, an inlet, a3, is shown for injecting waterfor rinsing purposes. Said fan-valve H is revolved by similar means asthose shown in Fig. 2, or those in Fig. 3 for the fan H.

In Fig. 9 the slot a is alternately shut and opened by means of anoscillating segmental bar, s, which is cast integral with the cast-ironThe oscillation of shaft So may be obtained in a similar way as themovement of the plate B in Fig. 3 by connecting a link connected to thedriving-shaft D in said gure, like the link 195,130 the end of ahorizontal arm, which is keyed to the end of shaft S.

Another contrivance is shown in Fig. 8, where the slot a is shut andopened alternately by a hinged cover,V,whi ch may be oscillated bysimilar means as has been described for segmental bar s in Fig. 9.

In Fig. 10, finally, the iiueA is shown separated from the space abovethe screen P by a slide, S, and the outlet a2 of tlue A is shut oropened bya slide, S. .Both these slides S S are alternately shut andopened by the eccentrics on shafts ss', respectively, andsaid shafts maybe driven from adriving-shaftin the same Way by belt or gears, as shownin Figs. Zand 3,respectively,1"or the shaft of the fan H,which is drivenfrom the driving-shaft D.

` Having thus fully described my invention, l

what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with a box (as K) and iiues with overflows, (as Yy,)of two inclined screen-plates, (as P,) means for holding the same inplace, (such as grooves p2 and wedgeshaped partition-plates 'I,)t1ues(as A) located i at the lower end of said screen-plates,with slots (asa) and outlet (as 112,) a fan-valve, (as H,) mechanism for working thesame, (as drivingshaft D and pulleys d2 11.2,) and means for rinsingsaid lilies, (as inlet 013,) all as shown and described, and for thepurpose set forth.

2. The combination, with a box (as-K) containingtwo screen-plates, (asP,) of means for holding said plates in place, said means coni sistingof grooves (as 192) and wedge-shaped partition-plate, (as 'I,)allsubstantially as shown and described, and for the purpose set forth.

3. The combination,with screens for sifting paper-pulp, (as P,) of flues(as A) for leading off the impurities, and mechanism for tlie pur-A poseset forth, said mechanism consisting of a fan-valve, (as H,)driving-shaft, (as D,) and pulleys, (as d2 and h2) all -to operate asset forth, j l

and substantially as shown and described.`

4. The combination, with screens for sifting j -K O) which contains thesame, and feeding- 1 paper-pulp (as P) and a box with outlet (as iiueswith overtlows, (as Y and y,) of an elastically-attached bottom plate,(as Band b,)

and mechanism for shaking the same, as driving-shaft D, eccentric disks,(as E,) angular levers, (as 123,) eye-pieces, (as 122,) andconnectinglinks, (as 114,) all to operate as set forth, and astitionplate T, the feed-fines with overflowsY 1 y', the line A, for theimpurities, with slot a and outlet a2, and the fan-valve H, the elas-`tically-attached door-plate (as B b) of the box,

the frame 7c, mechanism for shaking said floor'-` plate, as shaft D,eccentrics E, rods b, angular levers b3, and eye-pieces b2, andmechanism for operating the said fan-valve, as pulleys It and 612 all tooperate as set forth.

In testimony whereof I hereunto sign my name, in the presence of twosubscribing witnesses, this 21st day of November, 1884.

VVitnessesz'` EMIL BLUM, 'En EGLI.

iro

RUDOLF xeon.

